The two launchers are for clearance with the containment bar. One rest has a deeper groove so the arrow sits farther down in the rest than the other launcher arm. Use foot powder to see where you are getting contact. You should shoot your arrows with the cock vane up with this rest. That will give the most clearance with the launcher arm. If you are getting contact with the bar, use the deeper launcher to solve that. The cable also has to be adjusted properly. Once all of that is dialed in, you should not have any clearance issues. I had no contact at all shooting 28" arrows at 285fps.